♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/prismjs/components/prism-yang.js

@@ -1,20 +0,0 @@
-Prism.languages.yang = {
-	// https://tools.ietf.org/html/rfc6020#page-34
-	// http://www.yang-central.org/twiki/bin/view/Main/YangExamples
-	'comment': /\/\*[\s\S]*?\*\/|\/\/.*/,
-	'string': {
-		pattern: /"(?:[^\\"]|\\.)*"|'[^']*'/,
-		greedy: true
-	},
-	'keyword': {
-		pattern: /(^|[{};\r\n][ \t]*)[a-z_][\w.-]*/i,
-		lookbehind: true
-	},
-	'namespace': {
-		pattern: /(\s)[a-z_][\w.-]*(?=:)/i,
-		lookbehind: true
-	},
-	'boolean': /\b(?:false|true)\b/,
-	'operator': /\+/,
-	'punctuation': /[{};:]/
-};